Apparently the knowledge isn't wide enough, because this is the first I'm hearing of it... Why is gum bad for you? I knew it was in a downward sales trend, but I figured that was just consumer preferences changing over time.
Gum with sugar is bad for your teeth. Gum without sugar has xylitol in it, which is good for your teeth, but may increase your risk of heart attacks and strokes due to it promoting blood clotting[1].